Heater



FIG. 1 is a top plan view of a heater showing my new design;

FIG. 2 is a first side elevational view of the heater shown in FIG. 1;

FIG. 3 is a second side elevational view of the heater shown in FIG. 1, the view being the opposite side to that shown in FIG. 2;

FIG. 4 is a rear elevational view of an inversion of the heater shown in FIG. 1;

FIG. 5 is a front elevational view of the heater shown in FIG. 1; and,

FIG. 6 is a bottom view of the heater shown in FIG. 1. 

The ornamental design for a heater, as shown and described. 